Artefact in image

Acquisition Artifacts
5 replies•68 views
eric belanger avatar
eric belanger avatar

Need help for artefacts in my image 5867.jpg

Here's a jpeg link of starless HA IC2177 .

You can see artifact everywhere but especially in the corners . Does someone have an idea of what this is ?

About 50min of integration

Sharpstar 13028hnt

Antlia ha highspeed 3nm

I know i didnt have the Best collimation and maybe have some tilt

andrea tasselli avatar
andrea tasselli avatar
Not sure what you mean by "artefacts". Lot of noise I see and attendant noise reduction fake "details" produced by noise reduction, likely NXT. 3nm bandpass and f/2.8 at high CO don't make for happy company…
Tony Gondola avatar
Tony Gondola avatar

I do see some leftovers from the star removal process. Is that what you’re taking about?

eric belanger avatar
eric belanger avatar

I did a crop so we can see better . I dont know if it's stars . The shape is weird . For the filters , i use 3nm but for highspeed. Between f2.6 -3.6seagull~4.jpg

andrea tasselli avatar
andrea tasselli avatar
Exactly my prior analysis. These are the artefact produced by NXT with a noisy image like yours.
eric belanger avatar
eric belanger avatar

Hello Andrea. Even at f2.8 , of course it's noisy, just 50 minutes of integration ! Im gonna try something else for noise reduction.

I will check too without noise reduction if it's still there .

Thanks :)